Here is a complete chart from
http://mystictroll.com/zoo/index.html about raising your zoo rating...
Component/ Percentage/ CriteriaAnimal Happiness/ 25%/ 25 points available. Scaled rating of:
(Animal Happiness)/(Number of Animals)
Guest Happiness/ 25%/ 25 points available. Scaled rating of:
(Total Guest Happiness)/(Number of Guests)
Animal Health/ 15%/ 15 points available. 100% healthiness earns
total; 50% healthiness earns 7.5, etc
Species Diversity/ 10%/ 10 points available. Total award based on
percentage of 44 available species represented
in your zoo
Zoo Beauty/ 10%/ 10 points available. Overall zoo aesthetic
calculation is unavailable
Zoo Value/ 10% 10 points available. Scaled rating of: (Cash on
Hand)+(Sale Price of Total Zoo)/300
Zoo Research/ 5%/ 5 points available. Total award based on
percentage of research
100 points total.
Also follow the tips given by other members